JP2017109397A - Manufacturing method of synthetic resin rod having core grid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a synthetic resin rod having a core grid, which can surely prevent the core grid from slipping in a cavity.SOLUTION: A manufacturing method of a rod of the present invention includes a preparation step of manufacturing an insert member 24 by placing a synthetic resin protective tool 23 at an end part of a core grid 21, a step of setting the insert member 24 into a cavity 28 formed of a stationary metal mold 26 and a movable metal mold 27, and a step of filling a molten resin in the cavity 28 and solidifying, in which the protective tool 23 is formed from a synthetic resin of the same kind as a synthetic resin 32. In the step of setting, a flange part 23b of the protective tool 23 is sandwiched by an internal surface of the stationary metal mold 26 and an internal surface of the movable metal mold 27, after that, a molten resin is filled in the cavity 28. The protective toll 23 in a semi-completed product 31 after this molding is cut at a position close to one edge surface 23d of the protective tool 23 than an edge surface 21b of the core grid 21 to prepare a rod 4.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a rod used for an anchor bolt or the like, and relates to a method for manufacturing a rod made of synthetic resin with a cored bar.

  As a manufacturing method of the synthetic resin product containing the core metal, for example, as shown in Patent Document 1, the core metal (article) is supported by a support rod in the cavity of the mold, and in this state, So-called insert molding is known in which a molten resin is filled and solidified (molded).

Japanese Utility Model Publication No. 36-13793

  In the method of manufacturing a synthetic resin product containing a cored bar of Patent Document 1, the cored bar is only supported by the support rod, and therefore the cored bar is displaced by the molten resin poured into the cavity. There is a risk of molding in a shifted state.

  In this case, there is a problem that the core metal cannot be properly covered with the resin, and the core metal may be exposed on the surface of the molded product.

  The present invention is provided for the purpose of solving such inconveniences, and provides a method of manufacturing a rod made of a synthetic resin containing a cored bar that can reliably prevent the cored bar from moving in the cavity. There is to do.

  In order to solve the inconvenience, the present invention sets the cores 21 and 38 in the cavities 28 and 43 formed by the first molds 26 and 41 and the second molds 27 and 42, and A method of manufacturing a rod made of synthetic resin containing a cored bar, in which the cores 21 and 38 are covered with synthetic resins 32 and 39, and the cavity 28 and 43 are filled with a molten resin and solidified. Prior to the setting step, there is a preparatory step in which insert members 24 and 40 are prepared by attaching synthetic resin holders 23 to the end portions of the core bars 21 and 38 in the length direction. Is formed of the same type of synthetic resin as the synthetic resins 32 and 39, and when the insert members 24 and 40 are set in the cavities 28 and 43, the one end side of the holder 23 is attached to the first mold. Inside of 26 and 41 and second mold 27 and 42 After that, in the molding process, the cavities 28 and 43 are filled with molten resin, and the molded semi-finished products 31 and 44 are taken out from the molds 26, 41, 27, and 42. The rod 23 is manufactured by cutting the holders 23 of the finished products 31 and 44 at positions closer to the one end face 23d of the holder 23 than the end faces 21b and 38b of the core bars 21 and 38.

  Here, the rod 4 corresponds to a round bar shape, a square bar shape, a shape in which an external thread is formed on the outer peripheral surface, a bolt shape, or the like, and the core bars 21 and 38 have a round bar shape or a square bar shape. Or a bolt shape matching the shape of the rod 4 is applicable. When the rod 4 has a round bar shape or a square bar shape, the holder 23 is attached to at least one of both ends in the length direction of the core bar 21. When the rod 4 has a bolt shape, It will be worn on the opposite end of the head. Synthetic resins include any kind, including carbon fiber reinforced plastic and glass fiber reinforced plastic.

  Specifically, the holder 23 is attached to end portions of the core bars 21 and 38 in the length direction, and has a connecting portion 23a having an outer diameter smaller than the outer diameter of the rod 4 after molding, and a connecting portion. 23a and a flange portion 23b continuously provided on one end side of the housing 23a. When the insert members 24 and 40 are set in the cavities 28 and 43, the flange portion 23b of the holder 23 is attached to the first gold. The inner surfaces of the molds 26 and 41 and the inner surfaces of the second molds 27 and 42 are sandwiched. After that, in the molding process, the cavities 28 and 43 are filled with molten resin, and the cores 21 and 38 and the holding are held. The periphery of the connecting portion 23a of the tool 23 is covered with a molten resin and solidified, and the molded semi-finished products 31 and 44 are taken out from the molds 26, 41, 27, and 42 and held in the semi-finished products 31 and 44. At the connection portion 23a of the tool 23, the ends of the core bars 21 and 38 Will produce a rod 4 is cut at the position of the flange portion 23b nearer 21b · 38b. The connection part 23a and the flange part 23b of the holder 23 here correspond to a cylindrical shape or a prismatic shape.

  Moreover, the outer peripheral surface of the core bars 21 and 38 can be provided with irregularities. Here, the unevenness | corrugation by embossing, the unevenness | corrugation by processing a some groove | channel, etc. correspond.

  Specifically, the core bars 21 and 38 have a round bar shape, and are formed with male threads 21a and 38c on the outer peripheral surface thereof, and the male threads 21a and 38b of the core bars 21 and 38 are connected to the connection portion 23a of the holder 23. The female screw 23c into which 38c is screwed can be formed.

  In the preparation step, at least one spacer 35 may be disposed in the middle of the length direction of the cored bar 21. Here, the spacer 35 corresponds to a cylindrical shape or a rectangular tube shape, and the spacer 35 is made of the same type of synthetic resin as the synthetic resin 32 or a synthetic resin different from the synthetic resin 32. This is true.

  In the method for manufacturing a rod made of synthetic resin with a cored bar according to the present invention, the holder 23 is attached to the end of the cored bar 21/38, and one end of the holder 23 is connected to the inner surface of the first mold 26/41. And the inner surfaces of the second molds 27 and 42, the core bars 21 and 38 are properly positioned and held in the cavities 28 and 43 of the molds 26, 41, 27, and 42. It is possible to reliably prevent the 38 from moving in the cavities 28 and 43. As a result, the cores 21 and 38 can be appropriately covered with the synthetic resins 32 and 39.

  Moreover, since the holder 23 in the semifinished products 31 and 44 is cut at a position closer to the one end face 23d of the holder 23 than the end faces 21b and 38b of the core bars 21 and 38, the core bars 21 and 38 are made of the synthetic resin 32. -In addition to 39, it is also covered by a part of the holder 23, and the core bars 21 and 38 are reliably prevented from being exposed on the surface of the rod 4. As a result, it is possible to reliably prevent the cored bars 21 and 38 from being rusted by being exposed to the outside air and the appearance of the cored bars 21 and 38 being deteriorated by being seen.

  When the connecting portion 23a of the holder 23 is made smaller than the outer diameter of the rod 4 after molding, and the surroundings of the core bars 21 and 38 and the connecting portion 23a of the holder 23 are covered with synthetic resins 32 and 39, the holder 23 Can be firmly held by the synthetic resins 32 and 39, and the holder 23 can be prevented from falling off the rod 4.

  If unevenness is provided on the outer peripheral surface of the core metal 21 or 38, the area of the outer peripheral surface of the core metal 21 or 38 can be increased, and adhesion of the molten resin to the outer peripheral surface of the core metal 21 or 38 is ensured. Can be.

  When the male screw 21a is formed on the outer peripheral surface of the round bar-shaped metal cores 21 and 38, and the female screw 23c into which the male screws 21a of the metal cores 21 and 38 are screwed is formed on the connecting portion 23a of the holder 23, the metal cores 21 and 38 are formed. The molten resin can be firmly attached to the outer peripheral surface of the core metal 21/38 by increasing the area of the outer peripheral surface of the core metal 21, and the core metal 21/38 is tightened into the female screw 23c of the holder 23 so that the holder 23 is attached. It can be securely attached to the core bars 21 and 38.

  In the preparation step, when at least one spacer 35 is arranged in the middle of the length of the cored bar 21, even if the cored bar 21 is bent, the spacer 35 can prevent the cored bar 21 from contacting the inner surface of the cavity 28. As a result, it is possible to more reliably prevent the cored bar 21 from being exposed on the surface of the molded rod 4 due to the bent cored bar 21. As a result, it is possible to more reliably suppress the core metal 21 from being rusted due to the outside air and the appearance of the core metal 21 being deteriorated due to the core metal 21 being seen.

It is a perspective view of the anchor bolt to which the rod concerning the present invention is applied. It is sectional drawing which shows the use condition of the anchor bolt to which the rod concerning this invention is applied. It is sectional drawing which shows the use condition of the anchor bolt to which the rod concerning this invention is applied. It is sectional drawing which shows the insert member concerning the manufacturing method of this invention. It is sectional drawing for demonstrating the setting process concerning the manufacturing method of this invention. FIG. 6 is a cross-sectional view taken along line AA in FIG. 5. It is sectional drawing which shows the semi-finished product concerning the manufacturing method of this invention. It is sectional drawing which shows the cutting process concerning the manufacturing method of this invention. It is sectional drawing which shows the other Example of an insert member. It is sectional drawing for demonstrating the setting process concerning the other Example of an insert member. It is a top view of the bolt-shaped rod to which the manufacturing method of the present invention is applied. It is sectional drawing for demonstrating the formation process of the bolt-shaped rod to which this invention is applied. It is sectional drawing which shows the cutting process of the semi-finished product of the bolt-shaped rod to which this invention is applied. It is sectional drawing which shows the other Example of the spacer concerning an insert member. It is sectional drawing which shows another Example of the spacer concerning an insert member.

  An example of an anchor bolt to which a synthetic resin rod containing a core according to the present invention is applied will be described with reference to the drawings. As shown in FIG. 3, the anchor bolt is fixed to a mounting hole 2 provided in a wall surface 1 of a concrete ceiling, for example. As shown in FIGS. 1 and 2, the anchor bolt fixes a cylindrical rod (a resin molded product with a cored bar) 4 having a male screw 3 on the outer peripheral surface and the anchor bolt to the mounting hole 2. And a spreading mechanism 5 for the purpose.

  The expansion mechanism 5 includes a taper member 7 that has five inclined surfaces 10 formed on the outer peripheral surface, and an expansion member 8 that is externally fitted to the taper member 7. The inclined surface 10 of the taper member 7 is inclined so as to approach the central axis of the taper member 7 toward the proximal end side (lower end side in FIG. 2). The taper member 7 is provided with a female screw 6 penetrating along a central axis thereof with which the male screw 3 of the rod 4 is screwed.

  The expanding member 8 has five contact portions 12 each having an inner surface 11 fitted on each inclined surface 10 of the taper member 7 and a bridging portion 13 that can be elastically deformed. The inner surface 11 of each abutting portion 12 tapers toward the base end side (lower end side in FIG. 2) of the anchor bolt in a state of being in surface contact with each inclined surface 10 of the taper member 7 (state in FIG. 3). It inclines so that the central axis of the member 7 may be approached.

  The bridging portion 13 has five connecting portions 13b extending obliquely downward from the edge of the main body portion 13a to the outside of the bridging portion 13 and bent inward of the bridging portion 13 in the middle of the length direction. Each is connected to the tip of the contact portion 12 (the upper end side in FIG. 2). The outer peripheral surface 15 of each contact portion 12 is formed in the same cylindrical surface shape as the inner peripheral surface 2 a of the mounting hole 2. The taper member 7, the bridging portion 13, and the contact portions 12 are formed of stainless steel, aluminum alloy, or the like. A plurality of grooves 16 extending in the circumferential direction of the outer peripheral surface 15 of the contact portion 12 are formed on the outer peripheral surface 15 of each contact portion 12 of the expanding member 8.

  Then, when the anchor bolt is inserted into the mounting hole 2 with the spreading mechanism 5 facing up, the connecting portion 13b and the contact portion 12 of the bridging portion 13 are formed on the inner peripheral surface 2a of the mounting hole 2. It is pressed and temporarily fixed to the inner peripheral surface 2a of the mounting hole 2 by friction or the like.

  Next, for example, when the rod 4 is rotated around the central axis, the taper member 7 moves to the opening side of the mounting hole 2 by a screw action, and each inclined surface 10 of the taper member 7 moves the inner surface 11 of each contact portion 12. Push. Thereby, each contact part 12 moves to the inner peripheral surface 2 a side of the mounting hole 2 and is pressed against the inner peripheral surface 2 a of the mounting hole 2, and the outer peripheral surface 15 of each contact part 12 and the inner periphery of the mounting hole 2. The anchor bolt is fixed to the mounting hole 2 by friction between the surfaces 2a.

  As shown in FIG. 3, for example, a bracket 18 for fixing equipment or piping is attached to the rod 4 of the anchor bolt, and a nut 19 is screwed to the lower side of the bracket 18, so that the bracket 18 is attached to the anchor bolt.

  Next, an example of a manufacturing method of the rod 4 which is a cored resin molded product will be described with reference to the drawings. The rod 4 is produced by insert molding in which the core metal 21 is covered with the synthetic resin 22. That is, it is produced as follows.

  First, as shown in FIG. 4, the synthetic resin holders 23 are respectively attached to the left and right ends of the round bar-shaped cored bar 21 in the length direction to prepare the insert member 24 (preparation step). The cored bar 21 is formed of a metal such as stainless steel, a hard resin, ceramic, or the like, and a male screw 21a is formed over the entire length direction of the outer peripheral surface thereof.

  The holder 23 is attached to an end portion in the length direction of the core metal 21 and has a cylindrical connection portion 23a having an outer diameter slightly smaller than the outer diameter of the rod 4 after molding, It has a cylindrical flange portion 23b that is connected to one end side of the connection portion 23a (the side opposite to the core metal 21). The connecting portion 23a is formed with a female screw 23c along which the male screw 21a of the metal core 21 is screwed. The outer diameter of the flange portion 23b of the holder 23 is set to about the outer diameter of the rod 4 after molding.

  Next, as shown in FIGS. 5 and 6, the insert member 24 is formed in a cavity 28 formed by a fixed mold (first mold) 26 and a movable mold (second mold) 27. (Set process). At that time, the flange portion 23b of the holder 23 of the insert member 24 is sandwiched between the inner surface of the fixed mold 26 and the inner surface of the movable mold 27 (state of FIG. 5). The fixed mold 26 and the movable mold 27 are formed with female screw-shaped uneven portions 28 a for forming the male screw 3 of the rod 4 in almost the entire cavity 28.

  After the setting process, the sprue 29 formed in the fixed mold 26, the runner 30 formed over the fixed mold 26 and the fixed mold 26, and the pair of gates 34 and 34 are used. The cavity 28 is filled with the molten resin, and the periphery of the connecting portion 23a of the core metal 21 and the holder 23 is covered with the molten resin and solidified (molding step). The gates 34 and 34 are substantially opposite to the position of the connecting portion 23a slightly closer to the flange portion 23b in one holder 23 (left side in FIGS. 5 and 6) of the insert member 24 set in the cavity 28. It is formed to face the shape.

  The molten resin is made of the same type of synthetic resin as the holder 23. The metal core 21 is covered with the solidified synthetic resin 32 and the holder 23 by the molding. The female screw 23c of the connecting portion 23a does not extend to a position facing the gates 34 and 34.

  Next, the semi-finished product 31 after the molding shown in FIG. 7 is taken out from the molds 26 and 27 (extraction step). Next, in the connection portions 23a of the left and right holders 23 in the semi-finished product 31, as shown in FIG. 8, the position closer to the one end surface 23d of the holder 23 than the end face 21b of the core bar 21, that is, the core metal 21 is cut closer to the flange portion 23b than the end surface 21b of the 21 and closer to the end surface 21b of the cored bar 21 than the resin portion 33 remaining and solidified in the sprue 29 and the runner 30 (cutting step). By the cutting, the production (manufacture) of the rod 4 is completed. That is, the entire cored bar 21 is covered with a part of the connecting portion 23 a of each holder 23 made of the synthetic resin 32 and the synthetic resin of the same type as the synthetic resin 32.

  In this way, the holders 23 are attached to the left and right ends of the core metal 21, and the holders 23 are sandwiched between the fixed mold 26 and the movable mold 27, so that the core metal 21 is properly disposed in the cavity 28. Positioned and held, the synthetic resin 32 can be appropriately covered on the entire core metal 21.

  Since the core metal 21 is easily bent due to its own weight as it becomes longer, for example, in the insert member 24, the same kind as the synthetic resin 32 is provided in the middle of the length direction of the core metal 21 as shown in FIG. At least one cylindrical spacer 35 made of synthetic resin may be arranged. On the inner peripheral surface of the spacer 35, an internal thread 35 a that engages with the external thread 21 a of the core metal 21 may be formed.

  Thereby, even if the core metal 21 is bent when the insert member 24 is set in the molds 26 and 27, the core metal 21 is prevented from contacting (contacting) the inner surface of the cavity 28 by the spacer 35 ( (See FIG. 10). As a result, it is possible to more reliably prevent the cored bar 21 from being exposed on the surface of the molded rod 4 due to the bent cored bar 21.

  The present invention can also be applied to a method of manufacturing a bolt-shaped rod (hereinafter simply referred to as a bolt). That is, as shown in FIG. 11, the bolt 37 is formed by covering the entire bolt-shaped metal core 38 with the synthetic resin 39. The bolt 37 includes a bolt head 37a and a male screw portion 37b.

  A head 38 a (a right end in FIG. 11) having a predetermined shape is formed on the metal core 38 corresponding to the bolt head 37 a of the bolt 37. The head 38a of the cored bar 38 may have a hexagonal column shape or a cylindrical shape according to the hexagonal columnar bolt head 37a. The metal core 38 is provided with a male screw portion 38c (see FIG. 12) corresponding to the male screw portion 37b of the bolt 37. A male screw is formed on the outer periphery of the male screw portion 38c.

  Then, prior to the setting step, the insert member 40 is manufactured by attaching the synthetic resin holder 23 to the end portion in the length direction of the cored bar 38 (left end in FIG. 12) (preparation step). Thereafter, the insert member 40 is set in a cavity 43 formed by a fixed mold (first mold) 41 and a movable mold (second mold) 42 (setting step). At that time, the flange 23 b (one end side) of the holder 23 is sandwiched between the inner surface of the fixed mold 41 and the inner surface of the movable mold 42.

  After that, in the molding process, molten resin is filled into the cavity 43 through the sprue 45 and the runner 46 and solidified (molding process), and the semi-finished product 44 after the molding is taken out from the molds 41 and 42 (removal) Process). As shown in FIG. 13, in the holder 23 in the semi-finished product 44, a position closer to the one end face 23 d of the holder 23 than the end face 38 b of the core bar 38, that is, a flange portion than the end face 38 b of the core bar 38. Cut near the end surface 38b of the cored bar 38 from the resin portion 47 which is close to 23b and remains in the sprue 45 and the runner 46 and solidifies (cutting step). The cutting completes the manufacture of the bolt 37 shown in FIG.

  Thus, the manufacturing method of this invention is applicable also to rods of shapes other than a rod-shaped rod.

  The spacers 35 arranged on the core metal 21 may be, for example, a horizontal columnar shape, and, as shown in FIG. 14, a plurality of circumferential positions (4 in FIG. 14) of the horizontal columnar spacers 35. The resin passage 48 may be formed by cutting out a portion). By forming the resin passage 48, the molten resin can be quickly and accurately flowed to the other holder 23 (right side in FIG. 10) in the cavity 28, and can be molded appropriately. .

  Further, the circumferential surface of the spacer 35 may be curved in its length direction (left-right direction in FIG. 15), for example, as shown in FIG. Even in such a case, the molten resin can be quickly and accurately flowed to the other holder 23 in the cavity 28.

4 Rod 21/38 Core bar 21a / 38c Male thread of core bar 21b End face of core bar 23 Holding tool 23a Connecting part 23b Flange part 23c Female thread of connecting part of holding tool 23d One end face of holding tool 24/40 Insert member 26/41 Fixed mold 27/42 Movable mold 28/43 Cavity 31/44 Semi-finished product 32/39 Synthetic resin 35 Spacer

Claims (5)

A setting step of setting the core metal (21, 38) in a cavity (28, 43) formed by the first mold (26, 41) and the second mold (27, 42);
A synthetic resin containing a cored bar which covers the cored bar (21/38) with a synthetic resin (32/39), and has a molding step of filling the cavity (28/43) with a molten resin and solidifying it. A method for manufacturing a rod made of steel,
Prior to the setting step, there is a preparation step for producing insert members (24, 40) by attaching synthetic resin holders (23) to the lengthwise ends of the core bars (21, 38). And
The holder (23) is formed of the same type of synthetic resin as the synthetic resin (32/39),
When the insert member (24/40) is set in the cavity (28/43), one end of the holder (23) is connected to the inner surface of the first mold (26/41) and the second metal mold. It is sandwiched between the inner surfaces of the molds (27, 42), and after that, in the molding step, the cavity (28, 43) is filled with molten resin,
The molded semi-finished product (31/44) is taken out from the molds (26/41) / (27/42), and the core in the holder (23) of the semi-finished product (31/44). Core rod containing the rod (4) by cutting at a position closer to one end face (23d) of the holder (23) than the end faces (21b, 38b) of the gold (21, 38) Of manufacturing a synthetic resin rod. The holder (23) is attached to the end of the core metal (21, 38) in the length direction and has an outer diameter smaller than the outer diameter of the rod (4) after molding. A portion (23a) and a flange portion (23b) connected to one end of the connection portion (23a),
When the insert member (24, 40) is set in the cavity (28, 43), the flange portion (23b) of the holder (23) is attached to the inner surface of the first mold (26, 41). And the inner surface of the second mold (27, 42), and then, in the molding step, the cavity (28, 43) is filled with molten resin, and the core metal (21. 38) and the periphery of the connecting portion (23a) of the holder (23) is covered with the synthetic resin (32/39) and solidified,
The semi-finished product (31/44) after the molding is taken out from the molds (26/41) / (27/42), and the connecting portion of the holder (23) in the semi-finished product (31/44) In (23a), the rod (4) is produced by cutting at a position closer to the flange portion (23b) than the end faces (21b, 38b) of the cored bar (21, 38). A method for producing a rod made of synthetic resin containing a cored bar according to 1.   3. The method for manufacturing a rod made of synthetic resin containing a cored bar according to claim 1 or 2, wherein irregularities are provided on an outer peripheral surface of the cored bar (21, 38). The metal core (21/38) has a round bar shape, and has an external thread (21a / 38c) formed on the outer peripheral surface thereof.
The connecting portion (23a) of the holder (23) is formed with a female screw (23c) into which the male screw (21a, 38c) of the core metal (21, 38) is screwed. 3. A method for producing a rod made of synthetic resin containing a cored bar according to 3.   5. The synthetic resin rod containing a core metal according to claim 1, wherein at least one spacer (35) is arranged in the middle of the length direction of the core metal (21) in the preparation step. Production method.